<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type='info' @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主题区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' :'200px'">
        <div class="toggle-button" @click="toggleCollapse">
          |||
        </div>
        <!-- 侧边栏菜单区域 -->
        <el-menu :default-active="activePath" class="el-menu-vertical-demo"
          background-color="#313743" text-color="#fff" active-text-color="#409EFF" 
          unique-opened :collapse="isCollapse" 
          :collapse-transition="false" router>
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区域 -->
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for=" subItem in item.children" :key="subItem.id" @click="saveNabState('/'+subItem.path)">
              <template slot="title">
              <i class="el-icon-menu"></i>
              <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data(){
    return{
      // 左侧菜单数据
      menulist:[],
      iconsObj:{
        '125':'iconfont icon-users',//用户管理
        '103':'iconfont icon-tijikongjian',//权限管理
        '101':'iconfont icon-shangpin',//商品管理
        '102':'iconfont icon-danju',//订单管理
        '145':'iconfont icon-baobiao',//数据统计
      },
      //侧边菜单栏是否折叠,
      isCollapse:false,
      // 被激活的连接地址
      activePath:''
    }
  },
  // 生命周期函数
  created(){
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push('/login')
    },
    // 获取所有菜单
    async getMenuList(){
     const {data:res}=await this.$http.get("menus")
     if(res.meta.status !==200) return this.$message.error(res.meta.msg);
     this.menulist = res.data
    //  console.log(res);
    },
    // 点击按钮实现菜单的折叠和展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活
    saveNabState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath= activePath  
    }
  }

}
</script>

<style scoped lang="less">
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d37;
  display: flex;
  justify-content: space-between; //左右贴边对其
  padding-left: 0; //让图片左侧没有距离
  align-items: center; //让按钮剧中
  color: #fff;
  font-size: 20px;

  >div {
    //给左侧div加flex布局
    display: flex;
    align-items: center;

    span {
      margin-left: 20px;
    }
  }
}

.el-aside {
  background-color: #313743;
  .el-menu{
    border-right: none;
  }
}

.el-main {
  background-color: #e9edf1;
}

.iconfont{
  margin-right: 10px; //图片和文本之间有一个间距
}

.toggle-button{
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>